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agronomyS O U T H DA KOTA S TAT E UN I V ER S I T Y AGRONOMY, HORTICULTURE & PLANT SCIENCE DEPARTMENTAU G U S T 2 019Herbicide Rotation RestrictionsGared Shaffer SDSU Extension Weeds Field SpecialistHerbicides can persist and affect future crops. Many factors effect herbicide carry over; amount of moisture, soilPH, previous crop planted, soil texture, soil organic matter level, no-till, tillage, etc. When planning on rotating toanother crop always check the product label first to look for rotation restrictions. This is a quick reference guide tocommon herbicides and their rotation restrictions for selected crops. Refer to label to see if field bioassays shouldbe performed before planting rotation crops, especially for rotation intervals longer than 18 months.CornCorn HerbicidesAccuron FlexiAcuronSite Winter SpringWheat Wheat4Oats418Alfalfa Sunflower Sorghum110a18ProsoMillet1810a1818a18d10Anthem Maxx14,15NRNR4111041118Armezon Pro15,27NR944499918Atrazine(0.38 lb ai)5NR121212121212012Atrazine(0.38-0.5 lb ai)5NR122424242424012Atrazine(0.5-1.0 lb ai)5NR122424242424012Balance Flexx27NR6Bicep Lite II MagBreakfree NXT4418e10e6618ef24122412NR121NR1NCSNCSNCS5, 15NR121824182415NR121212129gBuctril listo k2k4k2k2k4kDual II R18mmEnlist Duo4,9Halex GT9,15,27NR10HarnessHarness 2424NCS2427NR933399918Page 1 2019, South Dakota Board of Regents
Corn HerbicidesInstigateKeystone NXTSite ofActionCornSoybeans2,27NR10Winter SpringWheat WheatAlfalfa Sunflower a181818NR18184181818Lumax EZNCSOatsp245,15,27NRNCSMetribuzin 75DF5NR4Outlook15NRNR4441111NR11Prowl 10.510.510.5Resicore4.584.58vSharpen14NR1v to 6vNRwNRwNRw4 to9v4v to 9vNRwNRwSolstice14, 27NR1044NR1010NR18xxxxxStatus4, 19Stinger10Surestart IIValor 10.510.510.5182,4,15NRNCS44NCSNCS18122614.25 to9eeNRy1 to 9z1 to 9z8 to18aa8 to18aa1 to 9z1 to 9z8 to18bb14, 2hhhh2,42,14,15NRxffNRNRggNR11Page 2 2019, South Dakota Board of Regentsii111046jj11kk
Corn Herbicide Reference Guide:Reference1NCSDefinitionUse seed treated with chloroacetamide productsNext Cropping Season, May rotate to specific crop not growing seasonNLNot labeled, herbicide label does not mention cropNRNo Restriction for rotating specific crop, unless specifiedaIf applied before June 1, if applied after June 1 or dry summer then rotation interval is 18 monthsb15 months if more than 2 lb atrazine applied or dry summercIf 4.875 oz/ac applied, 6 months if 5.7 oz/ac applieddIf 4.875 oz/ac applied, if 5.7 oz/ac applied then 18 monthseIf receive 15 inches of precipitation/yearfIf applied 2 lb atrazine or more, then 18 month intervalgMay be applied on young seedling onlyhAt 24 oz/ac rateiIf received 30 inches of precipitation in 17 month period after applicationjIf applied between 2.25 to 3.3 fl oz/ac, if applied above 3.3 fl oz/ac then 17 month intervalkIf applied 24 fl oz/ac or less, check label for applications above 24 fl oz/aclIf applied 12 oz/ac, if applied 13 fl oz/ac then 2 monthsmNo restriction if Enlist trait soybeans are planted or apply before non-Enlist corn emergesn18 month interval if the low rate of atrazine appliedo9 month interval for spring planted oatspUnless over 2 lb atrazine/ac appliedqIf receive 12 inches precipitation, 12 month interval for spring seeded and 14 month for fall seeded 12inches precipitationrIf receive 12 inches of precipitation, 18 spring seeded and 20 fall seeded with 12 inches of precipitationsIf receive 12 inchs of precipitationtMake sure seed does not contact herbicide, 24 to 64 fl oz 4 month intervalu18 month interval if applied 2 lb atrazine or morevCheck label before rotating, Up to 3 oz/ac .5 months, 4 oz/ac 4 months, 6 oz/ac 9 monthswUnless applied over 5 oz/ac then longer rotation required, refer to product labelx1 month rotation if receive 1 inch of precipitation after application before next cropyBelow 4 oz/ac, 4 oz/ac requires 4m and 6 oz/ac or greater 9 month intervalz2 oz/ac 1 month, 3 oz/ac 2 months, 4 oz/ac 4 months, 4 to 9 months for 6 to 12 oz/acaa2 oz/ac 8 months, 3 oz/ac 10 months, 4 oz/ac 12 months, 4oz/ac 18 monthsbb2 oz/ac 8 months, 3 oz/ac 12 months, 4 oz/ac 12 months, 6 oz/ac 18 monthscc 4 pt/ac next cropping seasondd1 month if crop loss/replant with 1 inch of precipitation after applicationee2 oz/ac 7 days, 3 oz/ac 14 days, 4 oz/ac 4 months, 6 oz/ac 9 monthsffNo restriction for IR/IMR corn but 1 month for IT corngg4 oz/ac 4 monthshh3 oz/ac 4 months, 4 oz/ac 6 monthsii18 oz 18 monthsjj3 oz/ac 10 months, 4 oz/ac 12 monthskk4 oz/ac 18 monthsPage 3 2019, South Dakota Board of Regents
SoybeanSite 1.5d4e4eAnthem Maxx14,15NRNR4f4f11g10411g181NR33333NR33Authority First2,14NR10441212301230Authority MTZ5,14NR4h4418121218i18Avalanche 58124.5121212kHerbicidesAssure IIBasis blendBoundary 6.5 ECBroadaxe XC2105,15NRWinter SpringWheat WheatOatsAlfalfa Sunflower 81818Metribuzin 75DFDuel 4Fierce14,15NR.25Flexstar GT 3.59,14NR10441818181818Harmony ExtraSG20.250.5NRNR1.51.51.51.51.5Liberty 280 R8.5q4r4r184181840Outlook15NRNR4NRNRNRNRNRNRValor SX14NRsNRt1 to 9u1 to 9u8 to18v8 to18v1 to 9u1 to 9u8 xProwl H2OSelect R44NCSNCSNCSNRNCSNRccccZidua2,14,15bbNR11Page 4 2019, South Dakota Board of Regentsdd111046jj11ff
Soybean Herbicide Reference Guide:Reference1NCSDefinitionUse seed treated with chloroacetamide productsNext Cropping Season, May rotate to specific crop not growing seasonNLNot labeled, herbicide label does not mention cropNRNo Restriction for rotating specific crop, unless specifiedaWith Bolt technology, 2.5 oz/ac 7 days on non-Bolt beansbApplied 2.5 oz/ac or more 2 month interval requiredcApplied 2.5 oz/ac or more 10 month interval requireddApplied 2.5 oz/ac or more 2 month interval requiredeApplied 2.5 oz/ac or more 6 month interval requiredfApplied 5.7 oz/ac or more 6 month interval requiredgApplied 5.7 oz/ac or more 18 month interval requiredhApplied 14 oz/ac or more 10 month interval requirediCan be planted at 12 months but may have crop damagej10 months for conventional beans/RR beans, No restriction for Bolt beans, 1 month for STS beanskApply no more than 1.9 lb s-metolachlorlFollowing lentils, soybeans, peas 8 monthsmClearfield corn no restrictionnApplied 3 oz/ac or more 1 month interval requiredoApplied 3 oz/ac or more 2 month interval requiredpApplied 3 oz/ac or more 12 month interval requiredqClearfield corn has no restrictionrClearfield wheat requires 3 monthss2 oz/ac 7 days, 3 oz/ac 14 days, 4 oz/ac 4 months, 6 oz/ac 9 monthstCheck label before rotating, Up to 3 oz/ac .5 months, 4 oz/ac 4 months, 6 oz/ac 9 monthsu2 oz/ac 1 month, 3 oz/ac 2 months, 4 oz/ac 4 months, 4 to 9 months for 6 to 12 oz/acv2 oz/ac 8 months, 3 oz/ac 10 months, 4 oz/ac 12 months, 4oz/ac 18 monthsw2 oz/ac 8 months, 3 oz/ac 12 months, 4 oz/ac 12 months, 6 oz/ac 18 monthsx 4 pt/ac next cropping seasonyIf receive 12 inches of precipitation, 12 month interval for spring seeded and 14 month for fall seeded 12inches of precipitationzIf receive 12 inches of precipitation, 18 spring seeded and 20 fall seeded with 12 inches of precipitationaaIf receive 12 inches of precipitationbb4 oz/ac 4 monthscc3 oz/ac 4months, 4 oz/ac 6 monthsdd18 oz 18 monthsee3 oz/ac 10 months, 4 oz/ac 12 monthsff4 oz/ac 18 monthsPage 5 2019, South Dakota Board of Regents
Wheat, Millet and OatsHerbicidesSite sAlfalfaSunflowerSorghum1ProsoMilletAim EC141111112111Axial vore4,6334434444aHuskie6, 270.250.25441NL9NR4Huskie gRaze2,4NRNR9h11NLcNLc9NLcNLcStarane Flex4,2NRNR93NR99312Starane 510.5i10.518Triumph 22k4NRNR36j36jNR36j36j36j36j1,6,2711491NCSj9444, 22291291822WolverineYukonWheat, Millet and Oats Herbicide Reference Guide:Reference1NCSDefinitionUse seed treated with chloroacetamide productsNext Cropping Season, May rotate to specific crop not growing seasonNLNot labeled, herbicide label does not mention cropNRNo Restriction for rotating specific crop, unless specifiedaNot labeled for no-till alfalfa, for tillage 4 month interval restrictionbNot labeled for no-till alfalfa, for tillage 9 month interval restrictioncNot labeled, perform bioassay before planting rotation cropdIf receive 24 inches of precipitation/year, 3 month restriction for STS soybeans with 18 inches of precipitationwith 7.5 ph soileIf receive 24 inches of precipitation 7.5 ph, IR corn 3 month with precipitation amount of 18 inches and 7.5ph soilfWith 35 inches of precipitation/year with 6.5 ph soilgWith 18 inches of precipitation and 7.5 ph soilh6 months with STS soybeansi18 months if 2% om and less than 15 inches of rainjPreform bioassay before planting cropPage 6 2019, South Dakota Board of Regents
Grain SorghumSite Rc1d to 6dNRNRcNRcNRc4d to 9d4d to 9dNRc14,15NRNRNR4NCSNCSNCS9NCSAtrazine(0.38 lb ai)5NR12NR121212121212Atrazine(0.38-0.5 lb ai)5NR12NR242424242412Atrazine(0.5-1.0 lb ai)5NR12NR24242424241215, 27NRNCSNR4.54.54.51818181HerbicidesLumax EzVerdictZemaxBuctril 4 EC6Clarity4NRNR1NRWinter SpringWheat NLNLNL6, 27NR0.250.25441Starane NXT4, 64NRNR44NRStarane ,429NR2229182Duel II Magnum15NRNRNR4.54.54.54NRNCSGrain Sorghum Herbicide Reference Guide:Reference1NCSDefinitionUse seed treated with chloroacetamide productsNext Cropping Season, May rotate to specific crop not growing seasonNLNot labeled, herbicide label does not mention cropNRNo Restriction for rotating specific crop, unless specifiedaUnless applied over 2 lb atrazine/yearbIf applied before June 1cUnless applied 5 fl oz/ac or more, then check label for restrictions for crop rotationdCheck LabeleOnly for seedling, Check labelfAt 24 oz/ac rategIf tillage is performed then 4 month rotation restrictionhNo restriction for IR/IMR corn but 1 month restriction for IT cornSDSU Extension is an equal opportunity provider and employer in accordance with the nondiscrimination policies of South Dakota State University, theSouth Dakota Board of Regents and the United States Department of Agriculture.P-00124Page 7 2019, South Dakota Board of Regents
Make sure seed does not contact herbicide, 24 to 64 fl oz 4 month interval. u; 18 month interval if applied 2 lb atrazine or more. v; Check label before rotating, Up to 3 oz/ac .5 months, 4 oz/ac 4 months, 6 oz/ac 9 months. w; Unless applied over 5 oz/ac then longer rota
